know-it-alls

plural of know-it-all
as in wiseacres
informal + disapproving a person who talks and behaves like someone who knows everything My neighbor is a real know-it-all, always telling me what to do.

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Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of know-it-alls Ignore imposter syndrome and the opinions of know-it-alls. Usa Today, USA Today, 11 Oct. 2025
Recent Examples of Synonyms for know-it-alls
wise guys
Noun
  • The Green Bay Packers made quite a Week 1 impression — at least with the wise guys in Las Vegas.
    Rob Reischel, Forbes.com, 9 Sep. 2025

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Cite this Entry

“Know-it-alls.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/know-it-alls. Accessed 18 Oct. 2025.

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